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This is a pic of half of my shed i have blacked out windows with builing paper, and lined with kingspan (whatever i could pick up from building sites) I used 4 in for the ceiling and top 2 ft of walls then 2 in on the rest, i plan on lining the rest of the ceilng outside the grow area with 4in and the top 2 ft of walls aswell. for infra red and helicopter reasons. it definatley works , just my body heat in there makes it hot , so must be not alot of heat escaping.
I Gonna need good exhaust. next i show where i plan to have exhaust .